Just Fantastic!
Believe me, when you grow up on this stuff, you always think you know exactly how it's going to go. All the time I was watching it I was thinking, "Well this is a different take on it." Honestly, I get sick of your classic fairy tale endings, which is why I started to take to reading the original Grimm Fairy tales. I applaud you for your creativity. You have successfully revived an old, tired story.
In fact, there's a story by the Brothers Grimm similar to this, only with a happy ending. You may want to look into it. I don't remember the title, just that it was the <something> tree. It's about a stepmother who murders her stepdaughter.
Again, just wonderful!